Pitman connection.



W. N. PARKES.

PITMAN CONNECTION.

APPLIOATION FILED JAN. 14, 1903.

Patented May 10, 1910.

WILLIAM N. PARKES OF BROOKLYN, NEW YORK, ASSIGNOR TO THE PARKES MACHINE COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

PITN CONNECTION.

T 0 all idiom it may concern:

Be it known that I. 'ILLIAM N. PARKES,

a citizen of the United States. residing in Brooklyn. county of Kings, and State of New York .,have invented a new and useful Improvement in Pitnian Connections, of which the following is a description. This invention relates to pitman connections or means for transmitting movement from one part to another in a machine. Some of its main objects are to provide an improved device for transmission of power from one part to another in a machine. means for taking up lost motion in the bearings of the device. and means adapting the movement transmitted through the device to be automatically varied or changed.

\Vith the above and other main objects in view. my invention consists preferably in the parts. featuies and combinations hereinafter described and claimed.

In the drawings :Figure 1 is a perspective view of my device and the connecting parts: Fig. 2 is a side elevation thereof;

Specification of Letters Patent.

Application filed January 14, 1903.

Fig. 3 is a longitudinal section taken on the T line 3-3 ofFig. 2: Fig. l is a vertical;

longitudinal section of the joint portion of the connecting mechanism showing details of construction: Fig. 5 is a side elevation thereof: Fig. 6 is a longitudinal section of the connecting link or pitinan showing details of means provided for lengthening or i shortening the same: Fig. 7 is a detail of the bearing block; and Fig. 8 IS a detail of the bearing 5. which cooperates with the;

bearing-blocks I).

Primarily. it is to be understood that my 2 connection device may be employed in any I part of a given train of driving mechanism. j

arranged in other relations and forms than those shown in the drawings. For the sake of illustration I have shown it applied for the purpose of converting oscillating or i shown in Fig. 3.

Patented May to, 19110. Serial No. 139.018.

carrying a ball I. Said ball is held between two bearings on opposite sides thereof one of which. as indicated by the reference character is a socket formed in the end piece 2 forming part of the pitman or link, and the other is a socket 2*, formed in the'nd of the rod 2, as can be clearly understood by the drawings. The said end of said rod 2, is threaded and located in a threaded hole which passes through the end piece 2, and into the aperture 2*, thereof, thus permitting the end of said rod to be used as a bearing for the said ball and also admitting of accurate adjustment of the bearings against the ball in assembling the parts, or in taking up wear in connection with the same. A jamnut 2 is provided for locking the parts just described in their proper position as will be seen more particularly in Fig. 3.

The aperture :2 is of sufiicient size to admit of the passage of the ball 1, and said aperture passes laterally through the end piece 2. In assembling these parts the ball is located in the aperture. then the rod 2 is screwed into its seat until its end enters the aperture and engages the ball. after which said rod is locked in its threaded seat by the lock nut :2. The end of said rod is concaved to conform to the periphery "of the ball. as is also the socket 2 as is plainly From the foregoing it is clearly seen that at this point in my device there is a universal joint. The ball 1* and the bearings which engage the same consti tale a hall or universal joint, but in this application this joint will be referred to as a ball joint. It is to be observed in connection with this joint that it is very simple and yet very efiective. This joint is composed of only four parts. namely the ball 1 formed on the end of a stem, the end piece '2. the end vibrating motion in one plane into oscil- I taking up all lost motion from wear in said lating or vibrating motion in a different plane.

In the drawings 1. designates an arm. or 1 part which may be provided and connected to any part to which movement is intended to be conveyed. Herein. this arm may be considered as forming a part of. or as atof the rod 2, and the lock nut- 2. And itis to be observed that these simple parts coustitute not only a ball joint. but means for oint.

The rod 2. terminates in a bore 3. formed in a connecting part 3. (the bore heinglong enough to permit of the longitudinal adjustment of the rodQ) which part. about the rod. has a reduced. split and externally screw-threaded portion 3'. The outer end of said portion 3". is made substantially conical and smooth as shown'at 3, this construction permitting the ready application of a clamping or compression nut 3. Said nut is internally screw-threaded to correspond with the portion 3", and is also narrowed or shaped internally at its head to correspond with the conlcal portion 3. Thus, as the nut is screwed upon the portion 3", its head is caused to compress the split portion and tightly bind the same upon the rod 2. This is a very effective and substantial means for securing the desired connection and adjustment of these parts. .At its outer end, the part 3, is externally screwthreaded as shown at 3, to cooperate with the internally screw-threaded end of the terininal portion 4. This portion 4, is bored longitudinally to and terminates in an enlarged aperture or second bore v5", which passes through an enlarged portion l, and at right angles to said first mentioned bore, the said enlarged portion bein slotted through its rim as shown at 4", an at right.

angles through said second bore as shown in Fig. 4. In the bore 5 are placed two bearing shoes or blocks, 5, 5, Fig. 7, each of which is substantially lano-convex in form, the plane portions 5, being provided with semi-circular grooves 5", and the convex portion being flanged at each end as shown at 5. The convex portion of the two bearing shoes or blocks when in position as shown in Fig. 5, conform to acircle" so that they just fit the bore 5", the flanges 5, extending on either side of the same, thereby retaining the shoes in the said bore 5". When said blocks are placed in said aperture or bore 5", they may be spread apart sufliciently forthe insertion of a rod 6 forming a part of the joint and carried by the actuating lever 6. Each of the two bearing shoes is sufficiently less than a half circle to permit of their insertion in the bore 5*, and after they are inserted and the rod 6 is in its way between said shoes, the latter are sufficiently separated along their straight edges to permit of the adjustment for taking up wear or lost motion. The semi-circular grooves 5", when the parts are assembled, conform to and embrace the rod 6.

The lever or arm 6, may be secured to any driving part or shaft as for example, to shaft 6", as at 6", and the said shaft may be operated in any usual manner. The said lever or arm 6 is provided with a segmental portion 6, in which is formed a curved slot 6 that is concentric with the axis of the ivot of said arm 6. vIn the said slot is ad- ]ustably secured in a usual manner, a bear- A ing bolt 6 which is provided with a clamp in nut 6. The rod 6 is provided with an en arged portion 6 through which the bearing bolt 6 passes, and the clamping nut 6. serves as a means for clamping the part 6 against the face of the segmental portion of the arm 6. The said rod 6, at its up r end is connected to a sleeve 6' by means 0 a horisame as shown in Figs. 4 and 8.

zontally extending portion formed on said sleeve 1n which the upper end of said rod is secured, and the sleeve is mounted to turn on the shaft 6".

The outer end of the terminal portion 4, is provided with a ball 4, which is engaged by an adjusting rod 7, which is suitably provided at its lower end with a piece 7 adapted to engage the said ball. The bearings, in the piece 7*, for the said ball may be substantially identical with the bearings in the piece 2. f

A hearing 5, is inserted in the longitudinal bore 4", in the part i, and intermediate the end of the part 3, and one of the shoes 5, the end next to the said shoe being concaved so as to conform to the periphery of the The joint is adjusted by screwing the part 3, into the bore 4", until the bearing 5 pushes the shoes 5, so there is no lost motion between the same and the rod 6, when the jam-nut 3, is setup to secure and retain the parts in their proper position.

As shown in Figs. 1 and 2, the rod 6 is curved in an arc of a circle which is concentric with the axis of the pivot about whichon the shaft 6 is for the purpose of permittin the saidrod to be ad usted in an arc of a circle about the axis of said shaft, andethe object of this adjustment will be presently explained. The object of the connecting rod 7 being mounted on the end of the pitman is for the purpose of furnishing means by which the end of the pitman may be moved toward and from the axis of the shaft 6". The extending part 6 of the sleeve is sufficiently away from the axis of the shaft 6 to permit the part of the pitman that is mounted on the rod 6 to be located central with respect to the axis of the shaft 6*, so that even though said shaft be oscillating no movement will be transmitted to the pitman.

By mounting the end of the pitman on the rod 6" as described several functions are secured, among which may be noted the following. A sliding bearing is secured between the end of the connection and the rod 6' by means of which the oscillating movement of the shaft 6 or the parts carried by it may be automatically increased and decreased. And this automatic change may be brought about by any suitable means such for example as that which is shown and described in my Patent 671,680, issued April 9, 1901. It is obvious that the oscillating arm M, shown in said patent may serve as a means for reciprocating the rod 7 of my present invention. and that the rod 7 may be connected to said arm as is the connection m shown in said patent. This construction at the end of, said connection serves the further function of convenient means for taking up lost motion between the bearings and the rod 6, means for preventing the pitman or connection from turning on its longitudinal axis, and a means for permitting the said pitman at said end to turn on an axis that runs at right angles to the length of the rod 6. Or in other words permitting the pitman to move vertically in an arc of a circle about a llOllZOlltzll axis. which axis is the center of the segment bearings 5. And by reason of the construction at this end the further function 1s secured of preventing the pitman from turning on its lon gitudinal axis. Referring now to the other end of said pitman connection it is noted that the ball joint at this point permits of a universal movement at this end of said pitman. The function of simplicity. dura bility and simple means'for taking up lost motion secured by this joint has been before noted. It is obvious that the adjustable connection between the two sections of the pitman which is secured by the thumb nut 3. serves as means for adjusting the length of the pitman. And it is also clear that by this means the length of the pitman may be maintained. For example lost motion may be taken up at its ends. and by this adjustment the taking up of said lost motion can be compensated for and the length of the pitman maintained.

The function of the adjustment of the lower end of the rod 6 in the slot 6 is to determine the direction of the increase and decrease in the longitudinal movement of the pitman relative to a center line. and consequently of the parts oscillated by the same. For example assuming that the posi tion of said rod in full lines in Fig. QIis such that the curve of said rod is concentric with the horizontal axis of the ball 1. and that the parts are moved from this position to the position shown in dotted lines in said figure. it is obvious that all of the increase and decrease in the extent of longitudinal movement of the pitman will be on one side of a center line. Assuming that the shaft 6 oscillates the parts in said figure from full to dotted lines, it is clear that as the end of the pitman is moved away from the axis of said shaft the lateral movement of the arm 1 will be increased from a center position to the left and vice versa. If it is desired to have this increase and decrease to the right of a center line then the lower end of the rod 6 is adjusted so that all of the movement of the same is from the osition it is shown in Fig. 2 to the right 0 said position. and if it is desired to have the increase and decrease extend from a center point to each of said pitman,

side of the same.

justing the lower end of the rod 6* a sufficient extent laterally, the zone of the lateral movement of the arm 1 may be changed so that the increase and decrease in the lateral movementof the same will not be from a center point. Or in other words the zone, or field of the lateral movement of said arm will be changed laterally. j v

Although I have described. and shown the rod (3 as curved. it is obvious that the said rod may be made straight. and that my in vention clearly anticipates so making it. if it is desired to use it constructed in this manner. and it is to be noted that said invention is not intended to be limited to the use of the said curved rod. The object of havingthis rod curved has been brought out in the foregoing statements of functions. and it may beadded that this invention is especially adapted for use in sewing machines in which a vertically reciprocating needle is adapted to be moved laterally. and it may be used in such a machine in connection with the transmis ion of movement from the driving shaft to the needle.

Having thus described my invention what I claim and desire to secure by Letters Pat cut is:

1. In combination, a pitman connection and means for transmitting movementthrough it comprising an arm adapted to oscillate. a rod carried by-said arm. a plurality of shoes carried by one end of said pitman. said rod located intermediate said shoes in such-a manner that the shoes are retained on the rod and may reciprocate thereon. means whereby the shoes may be reciprocated on the rod. and means whereby the pitman may transmit movement transmitted to it.

2. A pitman having an end through which a bore is formed substantially at right angles to the length of said pitman.- a plurality of shoes located in said bore. a rod disposed intermediate said shoes. means whereby said rod may be oscillated. meansfor retaining the shoes in said bore. means whereby the said shoes may be reciprocated on said rod, and means whereby said pitman may transmit movement imparted to it.

3. In combination. a pitman having an end portionthrough which a transverse bore is formed. two segments of a disk located in said bore. a way formed intermediate the plane. portions of said segments. a part located in said way. means adapting said partto be oscillated. means adapting the shoes to be reciprocate-d on said part. and means whereby the said pitman may transmit movement imparted to it.

4. In combination a pitman connection and means for transmitting movementihrongh it comprising a shaft that maybe oscillated. an arm attached to the end of said shaft in the lower end ofwhich there is a transverse way or slot formed, a' sleeve jonrnaled on said shaft, a hearing or rod, one end of said rod located in the said sleeve and the other end of said rod adjustably secured in said. slot, a pitman, one end of said pitman adapted to slide on said rod, means whereby said end of said pit-man may be reciprocated on said rod, and means whereby said pitnian may transmit longitudinal movement imparted to it.

In combination, a pitman connection and means for transmitting movement, through it comprising a part that is adapted to be oscillated, one end of said pit-man provided with two shoes that embrace said part, said end of said pitman adapted to turn on said shoes, means for adjusting said shoes to take up lost motion between the same and said part. means whereby said shoes may be reciprocated on said part, and means whereby said pitman connection may transmitmotion imparted to it.

In testimony whereof I have hereunto signed my name in the presence of two sub I scribing witnesses.

IVILLIAM N. PARKES.

\Vitnessesi CHAS. MCC. CHAPMAN, M. B. HOARE. 

